The 470 doesn't get quite as hot as a 480, I believe about 93c after a while at absolute max load, but real world temps will never be that high.
So to answer your question, running those two next to eachother should be fine.

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"As a result of all this hardship, dirt, thirst, and wombats, you would expect Australians to be a sour lot. Instead, they are genial, jolly, cheerful, and always willing to share a kind word with a stranger, unless they are an American." -- Douglas Adams

I wouldn't go with the 12Gb set. Often filling all six slots results in poorer performance.
The OCZ golds are a tried and true set, good enough timings too. My old ram was 9-9-9-24 and it ran like a champ, so 8-8-8-24 is plenty fine.

__________________

"As a result of all this hardship, dirt, thirst, and wombats, you would expect Australians to be a sour lot. Instead, they are genial, jolly, cheerful, and always willing to share a kind word with a stranger, unless they are an American." -- Douglas Adams

"As a result of all this hardship, dirt, thirst, and wombats, you would expect Australians to be a sour lot. Instead, they are genial, jolly, cheerful, and always willing to share a kind word with a stranger, unless they are an American." -- Douglas Adams